The bubble shafted clubs that I’ve re-gripped were 0.680” core. Most grips today are 0.580” or 0.600”. The re-gripping that I did was in 2018 & I purchased the grips from Golfworks as they had 0.680” grips for TaylorMade bubble shafts in stock at that time. I don’t see the 0.680” core grips listed at Golfworks today, but you can call them to see if they might have a few sitting around. It’s been a several years since I’ve checked EBay – one used to be able to find 0.680” core grips there. I’ll add that I measured the butt end of the shafts that I was working on were quite a bit larger in diameter to the 0.680” core grips & the fit was quite snug.